In their later work, Buck and Axel have shown that each olfactory receptor neuron remarkably only expresses one kind of olfactory receptor protein and that the input from all neurons expressing the same receptor is collected by a single dedicated glomerulus of the olfactory bulb.
Now, think about where the world would be today if we had the light bulb, but you couldn't focus light; if when you turned one on it just went wherever it wanted to.